Finding the Fourth Proportional to 12,675.72, 17,498.16 and 8,434.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,675.72 : 17,498.16 = 8,434.30 : x
2. Step 2: Convert to fraction form
   12,675.72/17,498.16 = 8,434.30/x
3. Step 3: Cross multiply
   12,675.72x = 17,498.16 × 8,434.30
4. Step 4: Simplify right side
   12,675.72x = 147,584,730.89
5. Step 5: Solve for x
   x = 147,584,730.89/12,675.72
6. Step 6: Final answer
   x = 11,643.10